Moving-picture-projecting machine



Dec. 8, 1925- 1.565.163

L. KIRAL MOVING PICTURE PROJEGTING MACHINE Filed 1924 2 Sheets-Sheet 1 v like lfi'ral WITNE ATTORNEY Dec. '8, l925-- 1,565,163

L. KIRAL I MOVING PICTUREPROJECTING MACHINE Filed Nov. 5, 1924 .2 Sheets-Sheet 2 mmmliilill m. g lllllllllllllllll Patented Dec.'8, 1925. 1

UNITED STATES LUKE \KIRAL, or BROOKLYN, NEW YORK..-

movme-rrcrunnrnomcrme MACHINE.

Application filed November 3, 1924. Serial No. 747,624.

1 all whom; it may concern Be it known that I, LUKE KIRAL, a citizen of Uniterl- States, residing at Brooklyn,

' should the film break during the showing of I in the county of Kings and State of New York, have invented new and useful Improvements in Moving-Picture-Projecting Machines, of which the following is a specification. I

This invention relates to moving picture projecting machines and has for its primary object, the provision of an attachment for preventing the film from being i nited the same.

Another object of the invention resides in a means for automatically closing the shut ter of a moving picture projecting machine while the machine is in operation, u on the breaking of the film, thereby protecting the I pointed out in t e appended claims, andare picture pro'ecting machine I the li e H of Figure 3.

illustrated in the accompanying drawing, in which f Figure 1 is a side elevation of a moving with my invention applie thereto.-

Figure 2' is an enlarged side elevation of a portion of a moving picture projecting machine showing the position when the shutter is raised in full lines, and the dotted lines illustrating the position of the parts when the shutter is in a lowered osition.

Figure 3 is an end elevatlon.

Fi re 4 is a horizontal sectional view on Figure 5 is an enlarged detail view of the shutter actuating means. I

Fi re 6 is a sectional view through the friction wheels on the line 66 of Figure 3.

-Referring more particularly to the drawings, the reference character A designates the lam -house of a. moving picture projecting mac ine, B a film magazme, C a second film magazine in which the film is wound determined distance.

the flange 16.

after passing'from the magazine B across the usual film opening. The take-up sprocket D is positioned between the maga zines for feeding the film from one magazine to the other. The usual shutter E is pivotally mounted as at F in a shield or housing G and which shutter is normally held open during the operation of the machine by a friction wheel H, and an arm J pivoted to the Wheel, and an arm- K carried by the shutter. scribed is old in the art, but a more detailed explanation after.

The friction wheel H comprises a pair of The mechanism so far deof the same will be given hereinsections 10 and 11, the section 11 of which is keyed to a shaft 12 which receives its power from a set of gears in the usual manner. The outer section 11 is formed with an annular collar 13 which extends within the outer section and serves as a bearing for a pair of sliding weights 14:, carrying shoes 15 for co-actlon with the outer flange 16 of the sect-ion 10 when the 'wheel is travelling at a high rate of speed whereby the two sect ions are rotatable simultaneously for a prev Springs 16 serve to normally hold the shoes out of contact with My invention comprises a member 17 having side arms which are upon the take-up sproc et shaft 18 and which straddle the take-up sprocket D. The lower end of the member supports a roller 19 over which the film M passes.- A link 20 has one end pivotally connected to one of the side arms 17 and its other end connected with one arm of a bell crank lever 21,- which arm is disposed within the frame or casing 22 of themachine. The other arm of the bell crank lever is disposed outside of. the casmgby forming the lever of two separate arms and keying them to a shaft 23 having its bearings in the casing 22 and in a bracket 24 secured to the outside of the casing. A link 25 connects the. outside arm of the bell crank lever with the section 10 of the friction wheel H, the free end of the link having a slot 26 therein for connection' with a pin or screw 27 extending from the secivotally mounted tion 10. A spring 28 is supported by the I of the machine. e spring acts to place a 11 piojecting from the casing I is set in motion the shaft to rotate by reason of the usual gearing tension on the member 17 when the film is in engagement therewith. The outward movement ofthe member bein limited by the outside arms of the bell cran lever abutting the bracket 24. The link is bent in a manner not to interfere with the mechanism on the outside of the frame, but it will be noted that the same may be straight if desired by slightly changing the position of certain parts.

' In practice, we shall presume that the machine is motionless, at which time the shutter E is in a closed position while the ,member 17 'is held depressed against the tension'of the spring 28 by the film M, and

the link 20, bell. crank lever 21 and link 25 are in. the position shown in full lines 3 in vFigure 2 of the drawing. As the machine 12 will be caused connected with the power shaft and as the I shaft rotates, the centrifugal force will cause the shoes 15 to frictionally engage. the flange on the sectionlO, thereby causing the said section to move a slight distance suflicient to move the arm J forward to swing the shutter E about its pivot F to an open position and to-hold the same in an open position as long as the disk is rotated. The ma chine is now in operationv and the film is being fed from one magazine to the other. Should the filmbreak, the tension on the member 17 will cease and the member will swing to the position shown in dotted lines in Figure 2 by reason of the spring 28. As the member moves forward, the link25 is also moved in. 'the same direction, thus causing the section 10 of the friction disk to rotatea slight distance in the direction ofthe arrow shown inFigure 2'which causes the arm J to be retracted, at which time the shutter E will automatically drop to a closed position by reason of its own weight thereby I protecting the film from the heat'of the are which is arranged within the lamp housing, and which gives put'intense heat suflicient to ignlte the. film 1n the event that the shutter did not instantly drop to a closed position.

dropped until the speed of the machine had Heretofore the shutter was not parting from the spirit of my invention,

While I have described what I deem to be the most desirable embodiment of my invention, it is obvious that many of the-details may be varied without in any way dee and I therefore do not limit myself to the exact deta'ilsof construction herein set forth nor to anything less than the whole of invention limited only by the appended claims. p

What is claimed as new is: 1. An attachment for moving picture pro- 'ecting machines comprising a member.

the take-up sprockadapted to be pivoted to et shaft of the machine, a link connectlng said. member with said bell crank lever, a-second link connected. with said bell crank lever, and a pin and slot connection between'said bell crank lever and.

the friction 'wheel of the machine, and spring means for holding said member undei' tension when said member is in co-acting engagement with a fihn strip. 3

2. In combination with the shutter of a moving picture projecting machine, a r0.- tatable shaft, a friction clutch including a part rotatable with said shaft and a second part movable with respect to said first part," an arm connected with said second party and engaging said shutter, means between said arts for raising said shutter when the, rotation of saidshaft reaches a predeter-i mined speed, a strip of film passing behind said shutter,. a spring pressed member held if in a depressed position by said'film, a link connected to saidsecond part and movable therewith,-and means between said spring pressed member and said lever for actuating said lever upon the breaking of the film I to move said second part with respect to said. first part for retracting said arm from engagement with said shutter. 7 -In testimony whereof I have afiixed my L KE KIRAL."

a bell crank lev r 

